3x+21=8x-4

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Solution for 3x+21=8x-4 equation: 



3x+21=8x-4

We move all terms to the left:

3x+21-(8x-4)=0

We get rid of parentheses

3x-8x+4+21=0

We add all the numbers together, and all the variables

-5x+25=0

We move all terms containing x to the left, all other terms to the right

-5x=-25

x=-25/-5

x=+5

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